NO. 2292. 



NEW FOSSIL TURTLES— GILMORE. 



119 



Baena antiqua Lambe now appears to be distinguished from all 

 other members of the genus, except B. callosa Hay, by the proportion 

 of the posterior lobe, especially the straightness of its sides and the 

 squarely truncated end without posterior median notch, and the 

 contracted posterior part of the carapace without a scalloped border. 

 The perforations of the shell at the ends of costals 2, 3, and 4, may 

 also be useful in distinguishing this species if these openings prove 

 not to be a juvenile feature. From B. callosa Hay also from beds 

 of equivalent age, the fragmentary character of the type specimen 

 renders its separation somewhat more difficult, though the smaller 

 size and differences in the proportions of the vertebrals and posterior 

 lobe of the plastron would appear to 

 show the distinctness of B. antiqua. 



BOREMYS ALBERTENSIS, new species. 



Plates 33 and 34. 



In 1906 :Mr. L. M. Lambe, of the Geo- 

 logical Survey of Canada, established* 

 the genus. Boremys, selecting as the 

 genotype a specimen from the Belly 

 River formation as exposed on the Red 

 Deer River, Alberta, Canada, previously 

 referred by him to Leidy's genus Baena. 

 The genus Boremys was characterized 

 as follows; 



"Supramarginal shields present in 

 the carapace; mesoplastra well devel- 

 oped, in contact in the median line for 

 some distance; intergular shield di- 

 vided; iiiframarginal shields present on 

 the bridges." 



Later the discovery of additional 

 materials enabled Lambe to give a de- 

 tailed description of the entire carapace 

 of Boremys pulchra.^ 



A turtle specimen recentl}^ acquired by the United States National 

 Museum from Mr. C. H. Sternberg, which was obtamed by him from 

 the BeUy River formation, shows_ characters which definitely dis- 

 tinguish it from Larabe's species, and the name Boremys albertensis 

 is here proposed for its reception. 



Type. — No. 8803, U.S.N.M., consists of the anterior three-fourths 

 of the carapace and practically the complete plastron. Collected by 

 Levi Sternberg, 1917. 



Fig. 2.— Plasteon of BaEna antiqua 

 Lambe. No. 8801, U.S.N.M. 06., ab- 

 dominal scute; an., anal scute; fern, 

 FEMOEAL scute; huvi., HUMERAL; hyo., 

 htoplasteon; hypn., htpopl4.stron; 



in. TO., INTRAMARGINAL SCUTES; meSO., 



mesoplastron; xiph., xiphiplastron. 

 Less than one-third natural size. 



1 Lambe, L. M. Ottawa Naturalist, vol. 19, No. 12, Mar., 1906, pp. 232-234. 



' Lambe, L. M. Trans. Royal Soc. of Canada, vol. 8, 1914, pp. 13-16; text-fig. 14. 



